Process of producing disilanerayon



h h IRQCESS. or

PRODUCING msrmnns RAYO Rudolph S. Bley', Elizabethton, Tenn, assignor to g North American Rayon Corporation, New York, N. Y., a corporation or Delaware i No Drawing.

The present invention relates to a preparing cellulosic spinning solutions from which soft-lustre products, such asfilaments, yarns, ribbons, films, etc., may. beproduced.

The primary object of my invention has to do with the incorporation of alkyl derivatives of disilane into cellulosic spinningsolutions, such as viscose and cuprammonium cellulose, which. will yield upon extrusion or molding soft lust're products of pleasing'hand. l

Anotherobject of my inventio'n'has to do with i the incorporation of hexamethyldisilane, into viscose and ouprammonium cellulose solutions.

A third object of my invention} relates to the manufacture of novel, soft-lustre?products per se containing alkyl derivatives of disilanes.

Other objects of my invention will become ap- 1' parent to those skilled in the art after a study of the following specification.

In the early days of rayon manufacture, the

demand was entirely for yarnshaving the highest degree of lustre. Later, when it was found that highly lustrous rayon too clearly indicated its origin-an-artificial fibre-a demand arose for artificial silk which more, mated to natural silk. The earliest attempt to meet the demand of dull-lustre viscose, for example, was a method of retaining sulphur particles in the fibres by discontinuing the normal desulphurizing step during its manufacture. Although this yarn showed decreased lustre, due to scattering of light by the sulphur particles, it was impermanent and exhibited an unattractive bloom. This method has been improved by dispersing, instead ofsulphur, fine inorganic and organic particles and globules in cellulosic spinning solutions, for example, pigments, hydrocarbons, oils, etc. When inorganic compounds, such as titanium dioxide, silica, etc. are dispersed in cellulosic spinning solutions, they tend to cut the thread guides through which they are led during the extrusion process, and in addition they weaken them considerably. Hydrocarbons, emulsified with spinning solutions to deluster cellulosic products obtained therefrom, have the great disadvantage of being inflammable, while vegetable oils become rancid and form skin-irritating acids.

I have, unexpectedly, found that alkyl derivatives of disilane (H3Sl.SiH3) possess properties which render them especially suitable as delustering agents for rayon products, since they are practically fire-resistant and do not form irriprocess, of

closely "approxi- Application obmbei 22, 1934, SerialNo. 749,485 1 8 Claims. (o1. 10s 40) tating decomposition products. 'I'hese1alkyl derivatives have the following structures: A h c -1. 'R.H2Si.SiH2.R

in which R and R2 represent alkyl radicals.

These radicalsmay be either identical or differ from each other. In other words,R and R: may represent botha methyl group, or R may be a methyl group and R: an ethyl group, etc. The

following table depicts a number of compounds which may be used in accordance with my present invention. L I 1 Table Derivativeshaving the structure: R.HgSi.SiI-I2.Re:

CHaHzSLSiHaCHd CsHmHzSLSiHaCsH? etc. V I Derivatives having the structure:

. BaHSLSiHJRQZ I 2 (CH3) .HSLSI'H'. (CH3) 2 2 (CH3) .HSi.SiH. (C2H5) 2 2 (CzHs) .HSi.SiH. (CzHs) 2 etc.

Derivatives having the structure:

Rz.HSi.SiH.(R)3

Example About 1 to of an alkyl derivative 01' disilane, for example hexamethyl-disilane (3 (CH2) Si.Sl (CH3) 3) is dispersed in and/or emulsifiedwith a celluloslc spinning solution, such as viscose and euprammonium cellulose, the aforementioned percentage being based upon the cellulose content of the solution. After uniformly distributing the delustering agent in the spinning solution, it is ex-.

' to include all truded through suitable spinning nozzles into a conventional spinning bath. Organic solvents, in-- organic or organic pigments, etc., may be added to the spinning solutions in addition to the silicon compounds. The amounts of these aliphatic silicon derivatives, to be added to the cellulosic solutions, may be varied at will. In this manner. more or less delustered rayon products may be obtained.

Modifications of my process will readily be recognized by those skilled in the art, and I desire derivative being liquid and stable in said spinning solution.

2 As a new article of manufacture, regenerated cellulose containing a small amountof an alkyl derivative of disilane having the structure RHaSLSfiBs.

in which throughout said cellulose.- a

3. A spinning solution for the manufacture of soft-lustre products comprising a solution of the group consisting of viscose and cuprammonium cellulose together with a substance of the group consisting of alkyl derivatives of disilane having the structure R..H.zSi.SiHiR: in which R and R: represent an alkyl radical, alkyl derivatives of disilane having thev structure RaH SLSiI-MRQ: in which R and R: represent an alkyl radical and alkyl derivatives of disilane having the structure R3.Si.Si.(R=)a in which R and R: represent those modifications falling within- I R and R: represent an alkyl radical, said disilane being liquid and finely dispersed an alkyl radical, said substance being liquid and stable in said solution. I

4. A spinning solution for the manufacture of soft-lustre products comprising a. solution of the group consisting of viscose and cuprammonium cellulose together with an aliqrl derivative ofdlsilane having the structure RaHSLSiHXRQ: in

which R and Re represent an alkyl radica h'said derivative being liquid and stable in said solution. 5. A spinning solution for the manufacture of soft-lustrefproductscomprising a solution of thegroup consisting of viscose and cuprammonium cellulose together with an alkyl derivative of disilane having the structure Rs.Si.Si.(R=) a in which Rand R: represent an alkyl radical, said allryl derivative being liquid and stable in said spinning solution. 1

6.- As a new article of manufacture, regenerated cellulose containing a small amount of a substance of the group consisting of alkyl derivatives of disilane having the structure RaHSLSiHXRQz in which R and Rs represent an alkyl radical, alkyl derivatives of disilane having the structure in which'R and R: represent an alkyl radical and alkyl derivatives of disilane having the structure RCi-Si.Si-(Rr)3 in which R andRe represent an alkyl radical, said substance being liquid and fine ly dispersed throughout said cellulose.

'7. As a new article of manufacture, regenerated cellulosecontaining a small amount of an alkyl derivative of disilane having the structure RLHSLSiI-IARI) a in which R andRe represent an alkyl radical, said derivative being liquid and finely dispersed throu hout said c l ulose.

8. As a new article of manufacture, regenerated cellulose containing a small amount of an aikvl derivative of disilane having the structure (measures;

in which R and R: represent an alkyl radical,

said substance being liquid and finely dispersed throughout said cellulose.

RUDOLPH S. BLEY. 

